Alan Charles Lancaster (7 February 1949 – 26 September 2021) was an English musician, best known as a founding member and bassist of the rock band Status Quo, playing with the band from 1967 to 1985, with brief reunions in 2013 and 2014. As well as contributing to songwriting, he was also one of the lead vocalists on albums and live concerts, taking the lead on tracks such as "Backwater", "Is There a Better Way", "Bye Bye Johnny", "High Flyer" and "Roadhouse Blues".

Alan Lancaster formed the group in 1962 with his then-schoolmate Francis Rossi. His final performance as a full-time member of Status Quo was at Wembley Stadium on 13 July 1985 for the opening of Live Aid. In March 2013, he collaborated with his old bandmates for a series of "Frantic Four" concerts in the UK.